Rain water harvesting

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1. RAINWATER HARVESTING MANOJ DAS.DCE,3 RD YEAR,ROLL-25

2. Rain Water Harvesting?. Rain Water Harvesting RWH- process of collecting, conveying & storing water from rainfall in an area – for beneficial use. Storage – in tanks, reservoirs, underground storage- groundwater

3. .ppt ( 4 ) Condensation Precipitation Evaporation Surface Water Infiltration Evapotranspiration Let ’ s take a look at The Water Cycle Consumption Surface Runoff Groundwater Sea water intrusion

4. .ppt ( 5 ) Why Rainwater Harvesting ? Conserve and supplement existing water resources Available for capture and storage in most global locations Potentially provide improved quality of water Supply water at one of the lowest costs possible for a supplemental supply source. Capturing and directing storm water (run-off) and beneficially use it Commitment as a corporate citizen - showcasing environmental concerns Public Mandate (India) Replenishing local ground water aquifers where l owering of water tables has occured

5. Surface runoff harvesting In this method of collecting rainwater for irrigation, water flowing along the ground during the rains will be collected to a tank below the surface if the ground

6. .ppt ( 8 ) Percolation Pit To divert rainwater into an aquifer, The percolation pit is covered with a perforated concrete slab The pit is filled with gravel/ pebbles followed by river sand for better percolation. The top layer of sand must be cleaned and replaced at least once in two years to remove settled silt for improving the percolation

7. .ppt ( 9 ) Ground Water Recharge Under natural conditions it may take days to centuries to recharge ground water by rain water. As we need to replenish the pumped water, Artificial Recharge of Ground water is required at some locations.

8. .ppt ( 10 ) Recharge Wells The runoff water from rooftops or other catchments can be channelized into an existing /new well via sand filter to filter turbidity and other pollutants Abandoned wells can also be used Cost-effective process, which not only conserves rainwater for immediate use but also helps to enhance the local ground water situation

9. THANK U ALL